[issue3426] os.path.abspath with unicode argument should call os.getcwdu

[Ezio Melotti]

Changes by Ezio Melotti <ezio.melotti at gmail.com>:


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dependencies: +Add a context manager to change cwd in test.test_support

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue3426>
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